When I open a program, it opens with my internet browser named opera. When I make a program open with something else, then all my others files also opens with it. I can download something, but I can't open it, because of it opens with opera. Somehow I made my antivirus work and I scanned my pc for viruses and it didn't find anything. I've tried to make my pc search for errors and I have also tried to make my computer go back in time, but it couldn't go enough back in time. Any help would be greatly appreciated, thanks. 
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